Abstract
We introduce relativistic charge distributions for targets with arbitrary average momentum, providing a natural interpolation between the usual Breit frame and infinite-momentum frame distributions. Among the remarkable results, we find that Breit frame distributions can be interpreted from a phase-space perspective as internal charge quasidensities in the rest frame of a localized target, without any relativistic correction. Moreover, we show that the unexpected negative center observed in the unpolarized neutron infinite-momentum frame charge distribution results from a magnetization contribution generated by the Wigner rotation.
Highlights
Electromagnetic form factors (FFs) of nucleons and nuclei have been measured over the past decades to an impressive level of precision; see, e.g., Refs. [1,2,3,4]
We show in the following that meaningful 2D charge distributions free of relativistic corrections can be defined for localized targets with arbitrary average momentum, provided that the requirement of a strict density interpretation is relaxed
We find that a negative center in the neutron infinite-momentum frame (IMF) charge distribution does not contradict the rest-frame picture and results from relativistic kinematical effects associated with spin
Summary
Electromagnetic form factors (FFs) of nucleons and nuclei have been measured over the past decades to an impressive level of precision; see, e.g., Refs. [1,2,3,4]. We show in the following that meaningful 2D charge distributions free of relativistic corrections can be defined for localized targets with arbitrary average momentum, provided that the requirement of a strict density interpretation is relaxed. We find that a negative center in the neutron IMF charge distribution does not contradict the rest-frame picture and results from relativistic kinematical effects associated with spin.
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